Microsoft's other founder, Paul Allen, promised his philanthropy will continue after his death while announcing a series of grants to mark the 20th anniversary of his charitable foundation.
Allen makes most of his grants to non-profits in the Pacific North West, where he lives. His foundation has donated more than $400m since …

Age shall not weary them,

...nor the years condemn.

Your horribly mangled misquote notwithstanding, It is possible that he and Bill will be remembered fondly in years to come, more for their philanthropic largess than for being the founders of some obscure software company.